Telephone-receiver.



1.1; COMER.

TELEPHONE RECEIVER.

APPLICATION FILED 001. 24, 1910. RENEWED SEPT. 12. 1914.

1,137, 186. Patented Apr. 27, 1915.

3 SHEETSSHEET l- KTTOK/Mxi 1.1. COMER.

TELEPHONE RECEIVER.

APPLICATION FILED OCT. 24. 1910. RENEWED SEPT. 12. 1914.

1,137,186. Patented Apr. 27, 1915.

F7? 3 SHEETS-SHEET 2- 5 6 1 0 WITNESSES J. J. COMER. TELEPHONE RECEIVER.

APPLICATION FILED OCT. 24. I910- HENEWED SEPT. 12. 1914- Patented Apr. 27, 1915.

JOHN J. COMER, OF CHICAGO, ILLINOIS, AS SIGNOR TO AUTOMATIC EITUNCIATOR' COMPANY, OF CHICAGO, ILLINOIS, A COBPORATIONOF ILLINOIS.

TELEPHONE-RECEIVER.

Specification of Letters Patent.

Patented Apr. 27, 1915.

Application filed October 24, 1910, Serial No. 588,790. Renewed September 12, 1914. Serial No. 861,488.

To all whom it may concern Be it known that I, JOHN J. CoMER, a citizen of the United States of America, and resident of Chicago, Cook county, Illinois, have invented a certain new and useful Improvement in Telephone-Receivers, of which the following is a specification.

My invention relates to telephone instruments in general, such as transmitters, receivers, and microphone repeaters, and more particularly to those that are adapted for use in loud speaking systems or any loud transmission systems for music or other similar purposes.

As herein disclosed, my invention takes the form of a telephone receiver, but it will be understood, of course, that I do not limit myself to any particular use for my invention, as it is capable of use in other connections, as, for example, in transmitters and microphone repeaters.

The object of my invention is to provide an improvedmechanical connection between the diaphragm of a receiver and the electromagnet mechanism for o crating the same, and to provide means or regulating the said connection, as by varying the leverage of a ortion of the connection, as well as by varylng the tension of the said diaphragm or other spring means to-which the said connection is subject, whereby the instrument is adapted more particularly for use in loud speaking systems in which clearness of enunciation and purity of tone are essential.

Another object is to provide, in a'telephone instrument of any suitable character, such as a receiver or transmitter or repeater, a lever which is adapted to vibrate in response to the telephonic current, and means for regulating or varying the leverage whereby the correct or desired character of transmission will be insured.

Another object is to provide, in a telephone instrument of any kind, a lever which is subject to the telephonic vibrations, and an adjustable fulcrum therefor, together with means whereby the adjustment of said fulcrum will serve to change or vary the leverage, thus affording opportunity for easy and effective adjustment of the instrument to obtain the desired results.

It is also an object to provide certain details and features of improvement and combinations tending to increase the general efficiency of a loud speaking telephone system, or of any other system in which heavy currents and powerful transmission is required to reproduce music, either vocal or instrumental, as will hereinafter more fully ap ear. I j

n the accompanying drawingsFigure 1 is a side elevation of a telephone receiver embodying the principles of my invention, certain portions thereof being broken away for convenience of illustration. Fig. 2 is a similar View of said receiver with the casing thereof removed. Fig. 3 is a View looking down on the instrument shown in Fig.

2. Fig. 4 is a section on line 44 in Fig. 1.

Fig. 5 is a cross section on line 55 in Fig. 4. Fig. 6 is a cross section on line 66 in Fig. 4. Fig. 7 is a rear end view of the receiver shown in Fig. 1. Fig. 8 is an enlarged longitudinal section of the operative portion of the said receiver. Fig. 9 is a detail perspective view of the stem or connection which extends rearward from the diaphragm of the receiver. Fig. 10.is a similar view of theadjustable lever that forms a part of the mechanical transmitting connection between the diaphragm and the electro magnet of the receiver. Fig. 11 is a similar view of the portion which servesas a fulcrum for the said lever. Fig. 12 is a similar view, considerablyv enlarged, of the pivoted arm or support upon which the said fulcrum is adjustably mounted, and whereby the tension of the diaphragm and the size of the air gap between the magnet and its armature may be regulated at will. Fig. 13

is a similar view of the link or connection that extends from the said adjustable lever armature a mounted thereon, through the medium of a supporting shoulder a whereby the telephonic currents, when received by the said electromagnet, serve to vibrate the said armature in front of the pole piece a;

The frame B is secured to the said permanent magnet as by a bolt 6, and is provided at its forward end with a cup 6' which holds the diaphragm C, the latter being clamped in place by an apertured front plate 0, in the manner shown. The said front plate is provided with a tube 0' which leads to the resonator 0 it being borne in mind that the receiver thus shown is adapted more particularly for use inloud speaking systems. The working parts of the receiver are covered by a cylindric casing D, and binding posts (I are provided at the rear end thereof for making the usual or any suitable circuit connections with the coil of said electromagnet. The said diaphragm C is provided with a stem E, which stem is threaded at e for connection with the said diaphragm, as by a nut e, and provided at its other end with an eye e', as shown more clearly in Fig. 9.

The frame B is provided with a pivoted arm or support F, the same being held in suitable connection therewith by a screw f extending through the side of the frame B, as shown more clearly in Fig. 6. The said pivoted support F has its rear or free end f connected by a screw f with the frame B, the spring f being. interposed between the top of the frame B and the underside of the arm F, whereby rotation of the screw in one direction will press the support F downward, and rotation of the screw in the other direction will allow the support to rise.

The support F is provided at its pivoted end with a vertical screw if: provided at its lower end with a cup or lcrum i which latter has an opening f at the lower end thereof. The lever G is provided with a head 9 that raises in the cavity of the fulcrum 7, the said lever extending downward through the opening f", whereby it is suspended for free back and forthswinging or vibratory movement. The said lever G extends through the eye 6 of the diaphragm stem.

The armature a has its upper end provided with a pin a, which latter is connected by a link H with the lever G, the said link inserting the pin at one end and the lever at the other end thereof.

The casing D is provided with an opening d immediately above the screw f, which opening is normally closed by a screw or plug (1 However, when it is desired to adjust the screw F, the plug d can be removed and a screw-driver inserted for this purpose.

The method of assembling for operation is substantially as follows: The parts are put together, as shown, and after the nut e is adjusted sufficiently to bring about a rough adjustment of the parts, the screw f is then adjusted to secure the desired degree of leverage. Then the screw f is adjusted to properly regulate the tension of the diaphragm C, as well as the size of the air gap between. the electromagnet and its armature a whereby both the armature and the diaphragm may vibrate in the manner desired, and without danger of the armature striking the core or pole piece of the said magnet. It will be seen that the change in leverage is by reason of the fact that the rotation of the screw 7? serves to raise and lower the fulcrum f thus in effect varying the length of the lever G, and consequently changing the leverage to suit the requirements. The tension of the diaphragm and the size of the air gap are regulated by the screw F, in the manner explained, because when this screw is rotated the support F is tilted one way or the other, and this results in a movement of the fulcrum f either toward'or away from the electromagnet. Thus the mechanical connection between the electromagnet and the diaphragm is provided with an efiicient system of regulation for insuring a proper condition of the parts. As shown, the amplitude of vibration of the diaphragm is somewhat greater than that of the armature in view of the fact that the distance between the stem E andthe link H is greater than the distance between the said link and the fulcrum F. In this way the vibrations are amplified, so to speak, and the telephonic currents received in the electromagnet are converted into mechanical vibrations, and in turn into atmospheric vibrations which can be heard clearly and distinctly understood at a considerable distance from the instrument. This leverage, though. as explained, can be varied, and can be made either greater or less, depending .upon the requirements of any particular case. e

As stated, and while I have shown my invention in connection with a telephone receiver, I do not wish to be limited' to such use, as the variable leverage connection can obviously be employed in transmitters or microphone repeaters, if such is desirable, and without in any way departing from the spirit of my invention.

As shown, the tension of the diaphragm, or other spring member, and the size of the air gap between the electromagnet and its armature are controlled or regulated by moving the fulcrum of the lever G either toward or away from the diaphragm. I do not, however, limit myself to this method of varying the tension to which the said lever is subject, or regulating the air gap, as it is obvious that other ways may be employed without departing from the spirit of my 1nvention. The variable leverage is, however, preferably obtained by an adjustment of the fulcrum of the lever. It is also obvious that the electromagnet mechanism of the receiver may be of different construction, and

that, moreover, the receiver may, if desired,

dropping downward through the opening between said knife edges. In this way the lever works on a practically frictionless fulcrum.

What I claim as my invention is:

1. In a telephone receiver, a resilient diaphragm, a lever, a connection from said diaphragm'to the lever, a fulcrum for said lever, a pivoted support on which said fulcrum is adjustably mounted, an electromagnet, an armature therefor, a connection from said armature to said lever, andmeans for adjusting said support about its axis, the adjustment of the fulcrum on said support serving to vary the leverage, and the adjustment of the said support serving to vary the air gap between said magnet and armature.

2. In a telephone instrument, a member to be vibrated, a lever, a'connec'tion' from the lever to said member, a fulcrum for said lever, a pivoted support on which said fulcrum is adjustably mounted, an electromagnet, an armature therefor, a connection from said armature to said lever, and means for adjusting said support about its axis, the adjustment of the fulcrum on said support serving to vary theleverage, and the adjustment of the said support serving to vary the air gap between said magnet and armature.

3. In a telephone receiver, a resilient diaphragm, an electromagnet, an armature therefor, a lever, a connection from the diaphragm to the lever, said connection being secured to said diaphragm, a link connection from the lever to the armature, a fulcrum for said lever, and means for adjusting said fulcrum to regulate the air gap between said magnet and armature.

4. In a telephone instrument, a member to be vibrated, responsive to telephonic currents, an electro-magnet for vibrating said member, a lever, an armature for saidmagnet, a link connecting said armature to said lever, and means for varying the leverage by movement of said lever to regulate the operation of .said member by said magnet. v

5. In a telephone instrument, a resilient member, a lever connected to said member, an electro-magnet, an armature therefor, a

connection from said armature to said lever,

and means for moving said lever to adjust the fulcrum for said lever.

6. In a telephone receiver, a resilient diaphragm, an electromagnet, an armature therefor, a lever pivoted at one end, means for adjusting the pivot for said lever, a link connection from the opposite end of said lever to said diaphragm, and a link connection at an intermediate point of said lever to said armature.

7. In a telephone receiver, a resilient diaphragm, a polarized electromagnet, an armature therefor, a lever pivoted at one end, means for adjusting the pivot for said lever, a link connection from the opposite end of said lever to said diaphragm, and a link connection at an intermediate point of said lever to said armature.

8, In a telephone receiver, a resilient diaphragm, an electromagnet, an armature therefor, a lever extending substantially parallel to said diaphragm, an adjustable fulcrum for one end of said lever, a connec tion from the opposite end of said lever to said diaphragm, and a connecting link extending from an intermediate point of said lever to said armature.

9. In a telephonereceiver, a diaphragm, an electromagnet, an armature therefor, a lever connected to said armature and said diaphragm, a support for said lever, and means for tilting said support to regulate the air gap between said armature and electromagnet.

10. In a telephone receiver, a diaphragm, an electromagnet, an armature therefor, a lever connected to said armature andsaid diaphragm, a support for said lever, means for tilting said support to regulate the air gap between said armature and electromagnet, and means for moving said lever to vary the leverage exerted.

11. In a telephone receiver, a resilient diaphragm, an electromagnet, an armature therefor, a lever pivoted at one end, a connection from the opposite end of said lever -to said diaphragm, and a connection at an intermediate point of said lever to said armature. v

12. In a telephone instrument, a diaphragm, an electromagnet for vibrating said 13th day v of October, 1910.

JOHN J. COMER. Witnesses:

E. H; CLEGG, S. LEWIS. 

